Schmahl, W. (1989). Redefining the process of retirement: An international perspective. Springer-Verlag.
Citazione stile Chigago Style (17a edizione)Schmahl, Winfried. Redefining the Process of Retirement: An International Perspective. Berlin: Springer-Verlag, 1989.
Citatione MLA (9a ed.)Schmahl, Winfried. Redefining the Process of Retirement: An International Perspective. Springer-Verlag, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.